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Efficiency of the photovoltaic systems under real work conditions on region of Cascavel. The purpose of the present work was to develop a study of an autonomous photovoltaic system, with energy storage, installed at the Experimental Agrometeorological Station of the Universidade Estadual do Oeste do Parana, Cascavel Campus, located at 24o59'S 53o26'W, 682 meters of altitude, under real field conditions, during the year of 2002. The efficiency of the photovoltaic modules was evaluated under real field conditions and its characteristic linear fit was determined. A Campbell Scientific CR10X micrologger was used to acquire data, programmed to conduct one reading per second from each channel and store the five-minute arithmetic data average from the readings of the incidence of global direct solar radiation (horizontal and global) on the panel, as well as area temperature, panel operational temperature, photovoltaic system tension and current. The results show that average monthly efficiency registered values in the range from 8.65 to 9.17%, with and average of 8.84%, and variation of 5.67%. Therefore, this array can supply a monthly average of 5.57 kWh per panel.